Oxygen Monitor SGM7.2.4/7.2.6 8 Operation
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8 Operation and parametrization
8.1
Operation
8.1.1
Switch-on and measurement indication
When the oxygen monitor is in operating state and all lines are connected
according to chapter 7.2, the SGM7.2.4 can be switched on. The
measuring cell reaches its operating temperature of 750 °C after approx.
10 minutes. The current measuring value is displayed but only reaches
the indicated error limits after an hour when the thermal conditions in the
measuring cell are even.
After switch-on, the SGM7.2.4 is in display mode. On the display the
programmed measuring value for output 1 is shown (normally the oxygen
concentration) according to the chosen dimension.
8.1.2
Gas flow adjustment
Two different flows can be adjusted via display (low 8 l/h, high 35 l/h)
For excess pressure of the measuring gas, the manufacturer
recommends the installation of a high-quality needle valve. Appropriate
needle valves can be delivered by the manufacturer of the SGM7.2.4. For
higher pressures of the measuring gas, an
additional
pressure regulator
is recommended which adjusts a pressure of approx. 100 kPa (1 bar)
excess pressure
.
8.1.3
Data monitoring
The SGM7.2.4 can be programmed with a limit value. The relevant
messages are delivered via relay output. The relay is open in active state
(This state is displayed in the status line). The signalization is delayed.
The response time can be adjusted for the data monitoring (limit value
delay time) between 1 and 99 seconds.
8.1.4
Indication of the end of maintenance interval for carbon filter
Before operation, the maintenance interval must be set for an optimum
value in the respective process. 600 hours are preset but on the basis of
experience, a considerably shorter operating time of the filter might be
expected.
Changes and reset of the maintenance interval are password-protected
(only possible via display).
The password in the delivery status is
1234
.
NOTE
